Tap Once and hit the reset...
Thanks for the tip. But...
Perhaps a little more explanation would be useful.
When I see the playlist I can only see the ratings control.
So I switch back to the album art in portrait mode.
I tap once.
And nothing happens.
I tap once again.
And nothing happens.
I tap and tap and tap and tap and tap and tap...
And FINALLY, the Repeat, play time, Genius, Shuffle control comes up.
I press the shuffle icon to make it white instead of blue and it is no longer stuck on shuffle.
So, Tap Once is a misnomer. I tested it again and again and tap once isn't sufficient. Basically, you have to tap it once for every time you've cursed Apple for this stupid, freaking, non-intuitive user interface. The more you curse them, the more Siri stacks up random tap costs.
Why oh why oh why is the ratings control more important than the repeat / playtime / genius / shuffle button control.